Passive geophysical exploration device



FIG. 1 is a front perspective of the passive geophysical exploration device showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a right end elevational view thereof, the left end elevational view being a mirror image thereof. 

The ornamental design for a passive geophysical exploration device, as shown and described. 